Lamdba Expression, Use Assignment Operator Instead Of Equality?
Oct 27, 2010
I have a method that takes an System.Action, this is what I'm trying to feed it:Function() Me._existingImports = Me.GetImportedAds()
The thing is that it complains about the = sign since it thinks I'm trying to do a comparison, which I'm not. I want to assign the Me._existingImports the value of Me.GetImportedAds(), but VB.NET complains about DataTable not having a = operator.
How can I force it to use the assignment operator instead of the equality operator?
In C# this works perfectly fine: () => this.existingImports = this.GetImportedAds()
For now the solution will be to use a standalone method, but that's way more code than needed.
So I'm writing the equality operator overload (Operator =())for a custom object, and the resulting mess of If conditionals is just an eyesore. But so far, it seems like the only sane way to check the values to as to match the specific behavior of this object.
The rules are:Num1 is required, period, and both the left and right operands and must be equal for True. Else, False.Num2 is optional, but if specified, must be present for both the left and right operands, and must be equal for True. Else, False.Num3 is optional, but can only be specified if Num2 is also present. Else, False.Num3, if specified, must be present for both the left and right operands, and must be equal for True. Else, False.
[Code]..
I also know that I could cache elements of the checks into booleans and then use those to reduce the amount of text. But that seems like a waste of cycles just for code readability. So I wanted to know if the SO community had better thoughts on reorganizing it, just in case I'm being too verbose with my checks.
I am having a structure that is actually a simple byte with more functionality.[code]...
If there would be a way to inherit from Structure I would simply inherit from Byte adding my functionality, basically I just need a byte Structure with custom functionality.
My question is also valid when you want to define your new singleton member value-types (like, you want to define a nibble-type for instance etc.) and you want to be able to set it with an assignment to number or other language typed representation.
My program has decided to assign pointers instead of make copies of an object, and I'm not sure why. I have something like this:
Public Class Foo Private myFooData As New List(Of FooData) Public Sub New(ByVal newFooData As List(Of FooData))
[Code]....
Very simplified, but basically what I'm doing. So for some reason today when I change item in newFoo.FooValues, originalFoo.FooValues also changes, and mainFoo does not. I've tried assigning the entire objects as well and I get the same results.
I am using VB.Net 2008 Express.I am trying to move a button on a form, the button status is unlocked. The code that I want to use is:
Me.btnEnter.Location.Y = 474
However, I get the error message, "Expression is a value and therefore cannot be the target of an assignment" If I now code as follows, I get the error message, "Property access must assign to the property or use its value"
Me.btnEnter.Location.Y
The errors appear contradictory. Just to check, I wrote the following
X = Me.btnEnter.Location.Y
And when run I received the correct answer of 535.What is happening? What am I missing?
When I have the following code, I get an "Expression is a value and therefore cannot be the target of an assignment." error as shown:
Public Class Form1 'Test Project Public Structure Blah Public ID As String
[code].....
But when I change the structure to a class, this works fine:
Public Class Form1 'Test Project Public Class Blah Public ID As String
[code].....
What connection am I missing between the two? I don't understand why the first example doesn't work, but the second does. Everything I know says they should both work just fine.
I'm "cloning" objects in my code. For instance: objClone = objOriginal My question is: Does the assignment operator in VB.NET 1.1 do a member-by-member copy of the objOriginal to objClone or does objClone simply point as a reference to memory referenced by objOriginal?
I have been working at this for awhile, searching everywhee, I keep getting the error: Syntax error (missing operator) in query expression 'UPC Code=051384628502'.The block of code this error originates from is: [code] When I make it into a comment, the program works, except it doesn't put the string value I want into the table, nor does it save it.
Function updateCoustmers(ByVal ID As String, ByVal codeq As String, ByVal nameq As String, ByVal birthdateq As String, ByVal addressq As String, ByVal mobilenumberq As String, ByVal phonenumberq As String, ByVal certificateq As String, ByVal dateofregisterq As String, ByVal nameofcourseq As String, ByVal priceofcourseq As String, ByVal
[code]....
this is wrong message shown to me ( Syntax error (missing operator) in query expression '[ID]='. )
i have to complete a room reservation projecti have a database called project21.mdb and there is 3 table inside rooms,users,and bookingsnow i facing a problems on display my filter data on the datagridview1 ,it appear syntax error(missing operator).this is my code ..i think the problems is appear in this line,but i just cant find the problemsDim cmd As OleDbCommand = New OleDbCommand("SELECT type,startdate,enddate,starttime,endtime FROM rooms,bookings WHERE[code]......
i am getting error while inserting record in ms access here is my sample code
Dim str As String cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:final.mdb;") cn.Open() str = "INSERT INTO 019loan (Salutationinteger,Customername,shortname,
I am using vb.net 2003 and accessing an Access 2002 database via oleDb and Jet 4.0.I am filling a set of text boxes with data from the database. The Connection, DataAdapter and DataSet are all set using the Wizard. The text boxes fill correctly with the first row of data. I then wished to filter the data so I went into the code and added a WHERE clause as follows:WHERE [Boat Name]=" & xid & "xid is the variable name given to the selected boat name. When I run the program I get the following error message:
i m having the following code please help me to find out where is error as i am new to vb.net...
device = ComboBox1.SelectedItem having a combobox which will choose any device from CPU , Monitor or Printer Private Sub show_details()Dim deviceNO As String ds.Clear()da.SelectCommand = Nothing deviceNO = ComboBox2.SelectedItem 'id of the device deviceNO.Trim()
I have program, which takes scripts (RGSS) and inserts them into a database. These scripts have lots of quotes and things like that inside them, but I don't think thats the issue here.
The error: Syntax error (missing operator) in query expression
This seems like it should be easy, and should work but I get the error: "Expression is a value and therefore cannot be the target of an assignment" I am placing this within the timmer, I just want to move the object back to it's starting point, is there a better way to do this, or why it's not working?
Syntax error (missing operator) in query expression 'Serial Number = 'L3FW341''.The Serial Number field is declared as text in Access Db. I am not sure which operator is missing in my command!Below is my code:[code]......
how to create a lamdba expression instead of using a regular comprehension linq queries. All of the examples i see are not query a database using linq to sql. i want to able to construct a lambda expression that get my the orders from the northwind database where the country equals "us". I know how to construct this using the standard linq query, but just not using lambdas in vb.net.
This is not a homework of mine and i had never tried ms access database with vb so i just gave it a shot. so this is my first time and i am just trying not asking anyone to complete my homework. I have been searching for this a lot on internet but couldn't find a solution to this so i decided to ask this question here. i have this sql code. what i want to do is that create a basic login form where users puts it's username in the UsernameTextbox and Password in the PasswordTextbox. If the the information match then a message box appears saying that the user is valid and if the information does not exist, a mesage box appears saying the users is not valid. now everytime i execute(run) the code, i come up with this error: Syntax error (missing operator) in query expression ''UserName' = 'Admin' 'PassWord' = 'testing123''.
The field names(UserName, PassWord) are also correct they are same as in the database. the information put in the username and password textbox are correct and they match the information on the database. But i dont know why this error comes up.
My code module is the following:
Imports System.Data.OleDb
Public Class LoginForm1
' Cancel button Private Sub Cancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Cancel.Click Me.Close() End Sub
